1

I want my Enemy to teleport behind me when i look at him, so it’s like an ambush or something else.

I tried to “mirror” my vector3 with the FirstPersonController as center, but it didn’t worked. Does anyone got an idea how to do this?

2

Sure:

 //Get the vector from the player to the enemy
 var currentDirection = (enemy.transform.position - player.transform.position);
 //Take it away from the player's position
 enemy.transform.position = player.transform.position - currentDirection.normalized * teleportDistance;

You could also use player.transform.forward instead of the currentDirection stuff and then it would be directly behind the player.